Linear current-sensor IC is thermally enhanced for high precision

News

7 November 2013

The new ACS770 from Allegro MicroSystems Europe is a fully integrated Hall-effect based linear current sensor IC incorporating thermal enhancement for high precision.

The new device consists of a precision, low-offset linear Hall circuit with a copper conduction path located near the die. Applied current flowing through this copper conduction path generates a magnetic field which the Hall IC converts into a proportional voltage.

The industry-leading total output accuracy of the ACS770 is achieved by using a new piecewise linear digital temperature compensation technique for offset and sensitivity. This greatly improves the IC’s accuracy and temperature stability without influencing the high-bandwidth (125 kHz) operation of the analogue output. Outstanding noise performance results from the use of proprietary amplifier and filter design techniques.

Device accuracy is optimised through the close proximity of the magnetic signal to the Hall transducer. A precise output voltage that is proportional to the current flowing in the conductor is provided by the low-offset chopper-stabilised BiCMOS Hall IC, which is programmed and calibrated for accuracy at the factory. Low power loss results from the fact that the internal resistance of this conductive path is typically only 100 microhms.

Allegro’s proprietary integrated shield technology provides high-level immunity to potential interference from current variations in the conductor path and stray electric fields, resulting in low output voltage ripple and low offset drift in high-side, high-voltage applications.

The thickness of the copper conductor allows survival of the device at high overcurrent conditions. The terminals of the conductive path are electrically isolated from the signal leads, allowing the ACS770 sensor ICs to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques.

The new device is targeted at the automotive, industrial and renewable energy markets.

The ACS770 family is lead (Pb) free. All leads are plated with 100% matt tin, and there is no lead inside the package. The heavy gauge lead frame is made of oxygen-free copper. The ACS770 is available in a 5-pin package (suffix CB).

Please click here to download a copy of the data sheet.

About Allegro

Allegro MicroSystems, LLC is a leader in developing, manufacturing and marketing high-performance semiconductors. Allegro’s innovative solutions serve high-growth applications within the automotive market, with additional focus on office automation, industrial, and consumer/communications solutions. Allegro is headquartered in Worcester, Massachusetts (USA) with design, applications, and sales support centers located worldwide. Further information about Allegro can be found at www.allegromicro.com

Allegro MicroSystems Europe, headquartered in Chertsey, United Kingdom, is the European sales and marketing operation, and operates a network of representatives and distributors throughout Europe. Allegro also has an engineering design centre in Edinburgh in Scotland and an application and marketing centre in Annecy in France.

Allegro MicroSystems Europe Ltd

Melita House

124 Bridge Road

Chertsey

Surrey

KT16 8LH

Tel: +33 (0) 4 50512359

Fax: +33 (0) 4 505 12083

mailto:allegroeurope@allegromicro.com

www.allegromicro.com

Media Contacts:

Mary Regan